With globalisation and rapid technological advancement, business cycles are short and disruptions take place. Businesses that face difficulties may scale down or shut down. When this happens, jobs will be lost. This loss of jobs has nothing to do with Free Trade Agreements in general, or CECA in particular.
CECA does not take away jobs. On the contrary, it has the potential to create new jobs. The provision for free flow of natural persons in Chap 9 is for a temporary purpose to facilitate the movement of people who wish to travel to do business. More business start-ups means more jobs.